<?php
    // +----------------------------------------------------------------------
    // | ThinkPHP [ WE CAN DO IT JUST THINK ]
    // +----------------------------------------------------------------------
    // | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
    // +----------------------------------------------------------------------
    // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
    // +----------------------------------------------------------------------
    // | Author: liu21st <liu21st@gmail.com>
    // +----------------------------------------------------------------------
    namespace think\view\driver;

    use think\App;
    use think\exception\TemplateNotFoundException;
    use think\Loader;
    use think\Log;
    use think\Request;

    class Php {
        // 模板引擎参数
        protected $config = [
            // 视图基础目录（集中式）
            'view_base'   => '',
            // 模板起始路径
            'view_path'   => '',
            // 模板文件后缀
            'view_suffix' => 'php',
            // 模板文件名分隔符
            'view_depr'   => DS,
        ];

        public function __construct($config = []) {
            $this->config = array_merge($this->config, $config);
        }

        /**
         * 检测是否存在模板文件
         * @access public
         * @param string $template 模板文件或者模板规则
         * @return bool
         */
        public function exists($template) {
            if ('' == pathinfo($template, PATHINFO_EXTENSION)) {
                // 获取模板文件名
                $template = $this->parseTemplate($template);
            }
            return is_file($template);
        }

        /**
         * 自动定位模板文件
         * @access private
         * @param string $template 模板文件规则
         * @return string
         */
        private function parseTemplate($template) {
            if (empty($this->config['view_path'])) {
                $this->config['view_path'] = App::$modulePath . 'view' . DS;
            }
            $request = Request::instance();
            // 获取视图根目录
            if (strpos($template, '@')) {
                // 跨模块调用
                list($module, $template) = explode('@', $template);
            }
            if ($this->config['view_base']) {
                // 基础视图目录
                $module = isset($module) ? $module : $request->module();
                $path   = $this->config['view_base'] . ($module ? $module . DS : '');
            } else {
                $path = isset($module) ? APP_PATH . $module . DS . 'view' . DS : $this->config['view_path'];
            }
            $depr = $this->config['view_depr'];
            if (0 !== strpos($template, '/')) {
                $template   = str_replace([
                                              '/',
                                              ':'
                                          ], $depr, $template
                );
                $controller = Loader::parseName($request->controller());
                if ($controller) {
                    if ('' == $template) {
                        // 如果模板文件名为空 按照默认规则定位
                        $template = str_replace('.', DS, $controller) . $depr . $request->action();
                    } elseif (false === strpos($template, $depr)) {
                        $template = str_replace('.', DS, $controller) . $depr . $template;
                    }
                }
            } else {
                $template = str_replace([
                                            '/',
                                            ':'
                                        ], $depr, substr($template, 1)
                );
            }
            return $path . ltrim($template, '/') . '.' . ltrim($this->config['view_suffix'], '.');
        }

        /**
         * 渲染模板文件
         * @access public
         * @param string $template 模板文件
         * @param array  $data     模板变量
         * @return void
         */
        public function fetch($template, $data = []) {
            if ('' == pathinfo($template, PATHINFO_EXTENSION)) {
                // 获取模板文件名
                $template = $this->parseTemplate($template);
            }
            // 模板不存在 抛出异常
            if (!is_file($template)) {
                throw new TemplateNotFoundException('template not exists:' . $template, $template);
            }
            // 记录视图信息
            App::$debug && Log::record('[ VIEW ] ' . $template . ' [ ' . var_export(array_keys($data), true) . ' ]', 'info');
            if (isset($data['template'])) {
                $__template__ = $template;
                extract($data, EXTR_OVERWRITE);
                include $__template__;
            } else {
                extract($data, EXTR_OVERWRITE);
                include $template;
            }
        }

        /**
         * 渲染模板内容
         * @access public
         * @param string $content 模板内容
         * @param array  $data    模板变量
         * @return void
         */
        public function display($content, $data = []) {
            if (isset($data['content'])) {
                $__content__ = $content;
                extract($data, EXTR_OVERWRITE);
                eval('?>' . $__content__);
            } else {
                extract($data, EXTR_OVERWRITE);
                eval('?>' . $content);
            }
        }

        /**
         * 配置模板引擎
         * @access private
         * @param string|array $name  参数名
         * @param mixed        $value 参数值
         * @return void
         */
        public function config($name, $value = null) {
            if (is_array($name)) {
                $this->config = array_merge($this->config, $name);
            } elseif (is_null($value)) {
                return isset($this->config[$name]) ? $this->config[$name] : null;
            } else {
                $this->config[$name] = $value;
            }
        }
    }
